gnodet-bot commented on code in PR #24844:
URL: https://github.com/apache/camel/pull/24844#discussion_r4014391107


##########
components/camel-apicurio-registry/src/main/java/org/apache/camel/component/apicurioregistry/ApicurioRegistryProducer.java:
##########
@@ -0,0 +1,241 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.component.apicurioregistry;
+
+import java.io.InputStream;
+
+import io.apicurio.registry.rest.client.RegistryClient;
+import io.apicurio.registry.rest.client.models.ArtifactMetaData;
+import io.apicurio.registry.rest.client.models.CreateArtifact;
+import io.apicurio.registry.rest.client.models.CreateArtifactResponse;
+import io.apicurio.registry.rest.client.models.CreateGroup;
+import io.apicurio.registry.rest.client.models.CreateVersion;
+import io.apicurio.registry.rest.client.models.GroupMetaData;
+import io.apicurio.registry.rest.client.models.IfArtifactExists;
+import io.apicurio.registry.rest.client.models.RuleViolationProblemDetails;
+import io.apicurio.registry.rest.client.models.VersionContent;
+import io.apicurio.registry.rest.client.models.VersionMetaData;
+import io.apicurio.registry.rest.client.models.VersionSearchResults;
+import org.apache.camel.Message;
+import org.apache.camel.spi.InvokeOnHeader;
+import org.apache.camel.support.HeaderSelectorProducer;
+
+public class ApicurioRegistryProducer extends HeaderSelectorProducer {
+
+    private final ApicurioRegistryEndpoint endpoint;
+    private final ApicurioRegistryConfiguration configuration;
+
+    public ApicurioRegistryProducer(ApicurioRegistryEndpoint endpoint,
+                                    ApicurioRegistryConfiguration 
configuration) {
+        super(endpoint, ApicurioRegistryConstants.HEADER_OPERATION, 
configuration::getOperation);
+        this.endpoint = endpoint;
+        this.configuration = configuration;
+    }
+
+    private RegistryClient getClient() {
+        return endpoint.getRegistryClient();
+    }
+
+    private String resolveGroupId(Message message) {
+        String gid = 
message.getHeader(ApicurioRegistryConstants.HEADER_GROUP_ID, String.class);
+        return gid != null ? gid : endpoint.getGroupId();
+    }
+
+    private String resolveArtifactId(Message message) {
+        String aid = 
message.getHeader(ApicurioRegistryConstants.HEADER_ARTIFACT_ID, String.class);
+        return aid != null ? aid : endpoint.getArtifactId();
+    }
+
+    @InvokeOnHeader(ApicurioRegistryConstants.OPERATION_CREATE_ARTIFACT)
+    public void createArtifact(Message message) {
+        String groupId = resolveGroupId(message);
+        String artifactId = resolveArtifactId(message);
+        String artifactType = message.getHeader(
+                ApicurioRegistryConstants.HEADER_ARTIFACT_TYPE, 
configuration.getArtifactType(), String.class);
+        String name = 
message.getHeader(ApicurioRegistryConstants.HEADER_ARTIFACT_NAME, String.class);
+        String description = 
message.getHeader(ApicurioRegistryConstants.HEADER_ARTIFACT_DESCRIPTION, 
String.class);
+        String content = message.getBody(String.class);
+        String contentType = message.getHeader(
+                ApicurioRegistryConstants.HEADER_CONTENT_TYPE, 
"application/json", String.class);
+        String ifExistsVal = message.getHeader(
+                ApicurioRegistryConstants.HEADER_IF_EXISTS, 
configuration.getIfExists(), String.class);
+
+        CreateArtifact createArtifact = new CreateArtifact();
+        createArtifact.setArtifactId(artifactId);
+        createArtifact.setArtifactType(artifactType);
+        createArtifact.setName(name);
+        createArtifact.setDescription(description);
+
+        if (content != null) {
+            CreateVersion firstVersion = new CreateVersion();
+            VersionContent vc = new VersionContent();
+            vc.setContent(content);
+            vc.setContentType(contentType);
+            firstVersion.setContent(vc);
+            createArtifact.setFirstVersion(firstVersion);
+        }
+
+        CreateArtifactResponse result = 
getClient().groups().byGroupId(groupId).artifacts()
+                .post(createArtifact, config -> {
+                    if (ifExistsVal != null) {
+                        config.queryParameters.ifExists = 
IfArtifactExists.forValue(ifExistsVal);
+                    }
+                });
+        message.setBody(result);
+    }
+
+    @InvokeOnHeader(ApicurioRegistryConstants.OPERATION_UPDATE_ARTIFACT)
+    public void updateArtifact(Message message) {
+        String groupId = resolveGroupId(message);
+        String artifactId = resolveArtifactId(message);
+        String content = message.getBody(String.class);
+        String version = 
message.getHeader(ApicurioRegistryConstants.HEADER_VERSION, String.class);
+        String contentType = message.getHeader(
+                ApicurioRegistryConstants.HEADER_CONTENT_TYPE, 
"application/json", String.class);
+
+        CreateVersion createVersion = new CreateVersion();
+        createVersion.setVersion(version);
+        VersionContent vc = new VersionContent();
+        vc.setContent(content);
+        vc.setContentType(contentType);
+        createVersion.setContent(vc);
+
+        VersionMetaData result = 
getClient().groups().byGroupId(groupId).artifacts()
+                .byArtifactId(artifactId).versions().post(createVersion);
+        message.setBody(result);
+    }
+
+    @InvokeOnHeader(ApicurioRegistryConstants.OPERATION_DELETE_ARTIFACT)
+    public void deleteArtifact(Message message) {
+        String groupId = resolveGroupId(message);
+        String artifactId = resolveArtifactId(message);
+        
getClient().groups().byGroupId(groupId).artifacts().byArtifactId(artifactId).delete();
+    }
+
+    @InvokeOnHeader(ApicurioRegistryConstants.OPERATION_GET_ARTIFACT_CONTENT)
+    public void getArtifactContent(Message message) throws Exception {
+        String groupId = resolveGroupId(message);
+        String artifactId = resolveArtifactId(message);
+        String version = message.getHeader(
+                ApicurioRegistryConstants.HEADER_VERSION, "branch=latest", 
String.class);
+
+        try (InputStream content = 
getClient().groups().byGroupId(groupId).artifacts()
+                
.byArtifactId(artifactId).versions().byVersionExpression(version).content().get())
 {
+            message.setBody(content.readAllBytes());
+        }
+    }
+
+    @InvokeOnHeader(ApicurioRegistryConstants.OPERATION_GET_ARTIFACT_METADATA)
+    public void getArtifactMetadata(Message message) {
+        String groupId = resolveGroupId(message);
+        String artifactId = resolveArtifactId(message);
+
+        ArtifactMetaData metadata = 
getClient().groups().byGroupId(groupId).artifacts()
+                .byArtifactId(artifactId).get();
+        message.setBody(metadata);
+    }
+
+    @InvokeOnHeader(ApicurioRegistryConstants.OPERATION_SEARCH_ARTIFACTS)
+    public void searchArtifacts(Message message) {
+        var results = getClient().search().artifacts().get(config -> {
+            String name = 
message.getHeader(ApicurioRegistryConstants.HEADER_ARTIFACT_NAME, String.class);
+            String groupId = resolveGroupId(message);
+            String description = message.getHeader(
+                    ApicurioRegistryConstants.HEADER_ARTIFACT_DESCRIPTION, 
String.class);
+            if (name != null) {
+                config.queryParameters.name = name;
+            }
+            if (groupId != null) {
+                config.queryParameters.groupId = groupId;
+            }
+            if (description != null) {
+                config.queryParameters.description = description;
+            }
+        });
+        message.setBody(results);
+    }
+
+    @InvokeOnHeader(ApicurioRegistryConstants.OPERATION_LIST_VERSIONS)
+    public void listVersions(Message message) {
+        String groupId = resolveGroupId(message);
+        String artifactId = resolveArtifactId(message);
+
+        VersionSearchResults results = 
getClient().groups().byGroupId(groupId).artifacts()
+                .byArtifactId(artifactId).versions().get();
+        message.setBody(results);
+    }
+
+    @InvokeOnHeader(ApicurioRegistryConstants.OPERATION_CREATE_GROUP)
+    public void createGroup(Message message) {
+        String groupId = resolveGroupId(message);
+        String description = message.getHeader(
+                ApicurioRegistryConstants.HEADER_ARTIFACT_DESCRIPTION, 
String.class);
+
+        CreateGroup createGroup = new CreateGroup();
+        createGroup.setGroupId(groupId);
+        createGroup.setDescription(description);
+
+        GroupMetaData result = getClient().groups().post(createGroup);
+        message.setBody(result);
+    }
+
+    @InvokeOnHeader(ApicurioRegistryConstants.OPERATION_TEST_COMPATIBILITY)
+    public void testCompatibility(Message message) throws Exception {
+        boolean compatible = doDryRun(message);
+        message.setBody(compatible);
+    }
+
+    @InvokeOnHeader(ApicurioRegistryConstants.OPERATION_VALIDATE)
+    public void validate(Message message) throws Exception {
+        boolean valid = doDryRun(message);

Review Comment:
   **Side-effect header not documented.** `doDryRun()` sets 
`HEADER_VALIDATION_ERRORS` on the message when `RuleViolationProblemDetails` is 
thrown, and both `testCompatibility` and `validate` delegate to it. For 
`validate` this is intentional and documented. For `testCompatibility` it is a 
surprise: users who call `testCompatibility` will find 
`CamelApicurioRegistryValidationErrors` set on the exchange when the schema is 
incompatible, with no mention of it anywhere in the docs or the Javadoc of 
`testCompatibility`.
   
   Either (a) clear the header inside `testCompatibility` after calling 
`doDryRun`, or (b) document that `testCompatibility` also sets 
`HEADER_VALIDATION_ERRORS` on incompatibility. Option (a) avoids polluting the 
exchange with validation-specific state when the caller only asked for a 
boolean result:
   
   ```suggestion
       @InvokeOnHeader(ApicurioRegistryConstants.OPERATION_TEST_COMPATIBILITY)
       public void testCompatibility(Message message) throws Exception {
           boolean compatible = doDryRun(message);
           // doDryRun sets HEADER_VALIDATION_ERRORS as a side-effect; remove 
it here
           // since testCompatibility returns the result in the body, not via 
headers.
           
message.removeHeader(ApicurioRegistryConstants.HEADER_VALIDATION_ERRORS);
           message.setBody(compatible);
       }
   ```



##########
components/camel-apicurio-registry/src/main/java/org/apache/camel/component/apicurioregistry/ApicurioRegistryConsumer.java:
##########
@@ -0,0 +1,101 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.component.apicurioregistry;
+
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+
+import io.apicurio.registry.rest.client.RegistryClient;
+import io.apicurio.registry.rest.client.models.SearchedVersion;
+import io.apicurio.registry.rest.client.models.VersionSearchResults;
+import org.apache.camel.Exchange;
+import org.apache.camel.Message;
+import org.apache.camel.Processor;
+import org.apache.camel.support.ScheduledPollConsumer;
+
+public class ApicurioRegistryConsumer extends ScheduledPollConsumer {
+
+    private final ApicurioRegistryEndpoint endpoint;
+    private final ApicurioRegistryConfiguration configuration;
+    private volatile Long lastSeenGlobalId;
+
+    public ApicurioRegistryConsumer(ApicurioRegistryEndpoint endpoint, 
Processor processor,
+                                    ApicurioRegistryConfiguration 
configuration) {
+        super(endpoint, processor);
+        this.endpoint = endpoint;
+        this.configuration = configuration;
+    }
+
+    @Override
+    protected int poll() throws Exception {
+        String groupId = endpoint.getGroupId();
+        String artifactId = endpoint.getArtifactId();
+
+        if (groupId == null || artifactId == null) {
+            throw new IllegalArgumentException(
+                    "Both groupId and artifactId are required for the 
consumer");
+        }
+
+        RegistryClient client = endpoint.getRegistryClient();
+        VersionSearchResults results = client.groups().byGroupId(groupId)
+                .artifacts().byArtifactId(artifactId).versions().get();
+
+        if (results == null || results.getVersions() == null) {
+            return 0;
+        }
+
+        List<SearchedVersion> versions = new 
ArrayList<>(results.getVersions());
+        versions.sort(Comparator.comparingLong(SearchedVersion::getGlobalId));
+
+        int count = 0;
+        for (SearchedVersion version : versions) {
+            Long globalId = version.getGlobalId();
+            if (lastSeenGlobalId == null || globalId > lastSeenGlobalId) {
+                Exchange exchange = createExchange(true);
+                Message message = exchange.getIn();
+
+                message.setHeader(ApicurioRegistryConstants.HEADER_GROUP_ID, 
groupId);
+                
message.setHeader(ApicurioRegistryConstants.HEADER_ARTIFACT_ID, artifactId);
+                message.setHeader(ApicurioRegistryConstants.HEADER_VERSION, 
version.getVersion());
+                message.setHeader(ApicurioRegistryConstants.HEADER_GLOBAL_ID, 
globalId);
+                message.setHeader(ApicurioRegistryConstants.HEADER_CONTENT_ID, 
version.getContentId());
+                
message.setHeader(ApicurioRegistryConstants.HEADER_ARTIFACT_TYPE, 
version.getArtifactType());
+                if (version.getState() != null) {
+                    
message.setHeader(ApicurioRegistryConstants.HEADER_VERSION_STATE,
+                            version.getState().getValue());
+                }
+
+                if (configuration.isFetchContent()) {
+                    try (InputStream content = 
client.groups().byGroupId(groupId).artifacts()
+                            .byArtifactId(artifactId).versions()
+                            
.byVersionExpression(version.getVersion()).content().get()) {
+                        message.setBody(content.readAllBytes());
+                    }
+                } else {
+                    message.setBody(version);
+                }
+
+                getProcessor().process(exchange);

Review Comment:
   **Exchange auto-release is missing.** `createExchange(true)` creates an 
exchange that `ScheduledPollConsumer` will auto-release — but only if you use 
the base-class exchange tracking. When you call 
`getProcessor().process(exchange)` directly and the processor throws, the 
exchange is abandoned without going through `releaseExchange`. The safer Camel 
pattern used by most `ScheduledPollConsumer` implementations is to call 
`defaultPollStrategy` or at a minimum wrap in a `try/finally`:
   
   ```suggestion
                   try {
                       getProcessor().process(exchange);
                   } catch (Exception e) {
                       handleException("Failed to process exchange for artifact 
version globalId=" + globalId, e);
                   } finally {
                       releaseExchange(exchange, false);
                   }
                   lastSeenGlobalId = globalId;
   ```
   
   With the current code, if `process()` throws, (1) the exchange is leaked, 
(2) `lastSeenGlobalId` is not updated, and (3) the entire `poll()` loop aborts 
— versions processed _after_ the failing one are never seen until the next poll 
cycle. Wrapping in `try/catch/finally` allows the loop to continue to the next 
version and lets the error handler decide how to report the failure.



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